@book { ZumWerdenderDeutschenStadt,
    title = "Zum Werden der Deutschen Stadt",
    subtitle = "Fragmente zur Geschichte, wo Quellen fehlen: Mainz, Worms, Goslar, Augsburg, Freiburg, Wien",
    author = "Kurt {Klaudy}",
    year = "2001",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1092407"
}